As U.S. immigration restrictions swiftly went into effect over the weekend, Google has pledged $4 million in donations for the American Civil Liberties Union, Immigrant Legal Resource Center, International Rescue Committee and UNHCR in its largest crisis campaign ever.

According to a report by USA Today on Sunday, Google created a $2 million crisis fund that can be matched with up to $2 million in donations from employees.

The order by President Donald Trump prevents people from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen from entering the U.S. for the next three months. 

In an internal memo sent to Google employees on Friday, recalling Google employees who were traveling internationally to the U.S., Google CEO Sundar Pichai said the order affects at least 187 of its staff. Google did not say if any of its staff were detained or blocked from boarding flights, according to Bloomberg.

In under 48 hours over the weekend the ACLU had brought in $42 million in online donations, around six times its average intake per year, according to WIRED.

On Sunday, the International Rescue Committee announced its first-ever emergency appeal of $5 million to cover "anticipated funding gaps tied to the Trump Administration’s executive order banning all refugee arrivals for 120 days, and Syrian refugees indefinitely."

Google co-founder Sergey Brin was among 1,000 protesters on Saturday at San Francisco International Airport, according to a report by Bloomberg.

Executives at other tech companies including Microsoft have spoken out against the order. In a statement, Microsoft called the executive order “misguided and a fundamental step backward.”